WHO has revised the pandemic alert for swine influenza to phase 5 on 29th April, 2009. US government site for authentic and updated information on flu pandemics is available at www.pandemicflu.gov. Phase 5 alert means that a pandemic is imminent. The virus strain causing swine influenza is H1N1 while the earlier avian flu pandemic was caused by the virus strain H5N1. The Director General of World Health Organization (WHO) Dr. Margaret Chan feels that the preparedness measures taken during the H5N1 avian influenza threat were an investment from which we …

Normal X-ray chest PA view demonstrating  cardiovascular structures. RPA: right pulmonary artery; LPA: left pulmonary artery; MPA: main pulmonary artery. Right heart border is formed by the right atrium. Linear shadow above the right atrial contour is the superior vena cava along the right para spinal region. Left heart border is formed by the main pulmonary artery segment above and the left ventricle below. The mild depression in between is the region of the left atrial appendage. Apex is formed by the left ventricle in the normal chest X-ray. The left …